This is because "-3" is parsed as an option to the command. You can use "--" to signify the end of the options and pass "-3" properly like so:
gconftool-2 -t int -s /app/myvalue -- -3 ** Package changed: gconf2 (Ubuntu) => gconf (Ubuntu) ** Changed in: gconf (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to gconf in Ubuntu. https://bugs.launchpad.net/bugs/1263671 Title: gconftool-2 does not accept negative values with --set Status in gconf package in Ubuntu: Invalid Bug description: # gconftool-2 -t int -s /app/myvalue -3 Error while parsing options: Unknown option -3. Run 'gconftool-2 --help' to see a full list of available command line options. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gconf/+bug/1263671/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp